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High-silica /greater than 60%/ lunar glasses in an Apollo 14 soil sample - Evidence for silicic lunar volcanismThe major-element compositions of 93 low-specific-gravity (less than 2.60) high-silica (greater than 60%) glass particles from a sample of lunar fines (14259,20) were determined by electron microprobe analyses. The size, shape, abundance, mineralogy, and major-element composition of more than 60% of the high-silica glasses is consistent with their being fragments of interstitial glass from mare basalts. However, one group of 30 glasses with between 72% and 78% SiO2 and an average of approximately 2.6% FeO can be distinguished from other high-silica glasses both chemically and petrographically. Glass particles with this composition do not contain crystalline inclusions and are fairly homogeneous not only within a single particle but also from particle to particle. The chemistry and petrology of these glasses suggest that they are not fragments of interstitial glass or shock-melted particles from a 'granitic' source rock. Rather, the homogeneity and lack of crystalline inclusions suggest that this group of high-silica glasses was the product of lunar acidic volcanism.
Document ID
19770030994
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Glass, B. P.
(Delaware, University Newark, Del., United States)
Date Acquired
August 9, 2013
Publication Date
November 1, 1976
Publication Information
Publication: Earth and Planetary Science Letters
Volume: 33
Subject Category
Lunar And Planetary Exploration
Accession Number
77A13846
Funding Number(s)
CONTRACT_GRANT: NGR-08-001-029
Distribution Limits
Public
Copyright
Other

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